for example world generation there could be so much stuff improved and also some furniture.

There are 2 images in the attachment which show what I mean.

Let me know when you wan't the help.

This isn't a excuse but this is the very first alpha version. If you into the creative search tab and scroll down you can find abunch of instant gen blocks which are not in the single player world yet. If you want to help you can always build a structure then schematic it

Item name: Land Mine!
How rare: You can find them in chests or trade in villages for them, You can also craft with 4 iron ingots and 4 gunpowder around a flint & steel to get 4.

Uses: When a zombie steps on this, BOOM! See ya, maggot bags! (as Dempsey would say)
Special: Only causes damage to the block directly under the mine, so you don't blow too many holes around your base.

Item name: Barricades
How rare: You can craft with 9 planks to give you 3 barricades.
Uses: Put these around to stop zombies getting to you. You can board up windows and doors with them, but zombies will try to break them!
Special: If you are out of weapons you can also whack zombies with them, only causes 2 damage per hit and they have 10 durability.

Item name: Ammo belt
How Rare: Can buy in villages.
Uses: Equip to your legs/belt slot. You can now carry more ammo!

Item name: Forest Camo Suit
How Rare: Found only in dungeons, very rare.
Use: A full suit will only allow zombies to see you when they are within 3 blocks of you, as long as you are in a forest biome.
Other ones: City Camo Suit, Desert Camo Suit, Mountain Camo Suit, Snow Camo Suit, Night Camo Suit.

Camo for guns too!

Item name: Explosive crossbow
How Rare: You can trade with villagers for them.
Use: Load with bolts, and fire! Each bolt will delay 3sec then explode on impact. Can explode if they hit walls etc as well so you could use them to set off other explosives...

Item name: Bicycle
How Rare: You can craft them, with 4 leather around 1 ingot for wheels, then put these with 5 more iron ingots and a saddle.
Use: The zombies might be fast, so you will need a quicker means of escape than just your feet!
Special: Uses hunger 4x faster but you travel 3x faster.